The invention relates to the technical field of manufacturing equipment of carbon brushes, and discloses a carbon brush wire installation cutter. The cutter comprises a machine frame; a wire tank is arranged on the machine frame; the two side walls of the wire tank are provided with a first through hole and a second through hole, and the wire tank is further provided with a sliding groove; the sliding groove communicates with the second through hole; rotating rods are arranged above the first through hole and the second through hole and provided with arc-shaped racks; the machine frame is provided with a hanging plate; a spring is arranged on the hanging plate, and the other end of the spring is connected with a cutting tool; the left surface and the right surface of the cutting tool are provided with teeth; teeth of the arc-shaped racks are all arranged on the surfaces close to the cutting tool; the machine frame is further provided with an intermittent gear; an eccentric column is arranged in an eccentric position of the intermittent gear and provided with a pull rod; the other end of the pull rod is connected with a lantern ring; the lantern ring penetrates through the sliding groove and arranged on the bottom wall of the wire tank; the outer side of the intermittent gear is provided with a spur rack engaged with the intermittent gear; and the spur rack is fixedly connected with the cutting tool. Through the carbon brush wire installation cutter, cut wires can be automatically pulled.